I created a slideshow that has an audio track on each slide. I then modified the slide master (added variable and triggers that would force completion of audio track for each slide before user could navigate to next slide using next button). How do I update the slideshow with the modified slide master? It doesn't appear to be saving properly - even though I tried changing by the individual slide, it doesn't seem to save - when I close the slide master and open again (even after saving the file) the modified slide master is only showing as a "reserved" slide master. I can't seem to apply the modified slide master to existing slides. Help?